OCT to
DEC Converter Online

Converting octal numbers to decimal helps understand the numeric values of Unix file permissions and other octal representations.

number-base

Input

Output

Enter a number and click Convert

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OCT → DEC

Ctrl+↵ convert

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Decimal (DEC)

Convert from/to decimal number system

Binary (BIN)

Convert from/to binary number system

Hexadecimal (HEX)

Convert from/to hexadecimal number system

Octal (OCT)

Convert from/to octal number system

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DEC to HEX Converter Online DEC to BIN Converter Online HEX to DEC Converter Online BIN to DEC Converter Online OCT to HEX Converter Online

Frequently Asked Questions

01 How do I convert an octal number to decimal?

Each digit of the octal number is multiplied by the corresponding power of 8. For example, 377₈ = 3×64 + 7×8 + 7×1 = 255₁₀.

02 What do chmod numbers mean?

In chmod, each digit is the sum of permissions: read (4) + write (2) + execute (1). For example, 755₈ = owner rwx (7), group r-x (5), others r-x (5), which equals 493 in decimal.

03 How do I write an octal number in code?

In most programming languages, octal numbers use the prefix 0o (Python, JavaScript) or 0 (C, Java). For example, 0o377 = 255 in decimal.

OCT to DEC Converter Online